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title="作者" class="beLink" data-v-06225672>lingxin</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2023-01-25</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="">JSDOM和BOM学习第五天（下）<!----></h1>  <div class="theme-vdoing-content content__default"><h1 id="js-bom-和-dom-学习第五天-下"><a href="#js-bom-和-dom-学习第五天-下" class="header-anchor">#</a> JS BOM 和 DOM 学习第五天（下）</h1> <p><img src="https://img-blog.csdnimg.cn/8a651e8bb07443408aec7453d96dc5f3.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <p>@<a href="%E7%9B%AE%E5%BD%95">toc</a></p> <h2 id="_1-动画函数"><a href="#_1-动画函数" class="header-anchor">#</a> 1.动画函数</h2> <h3 id="_1-1-缓动函数"><a href="#_1-1-缓动函数" class="header-anchor">#</a> 1.1 缓动函数</h3> <ul><li><strong>运动速度不是匀速，速度是慢慢变化的</strong></li></ul> <h4 id="一个示例"><a href="#一个示例" class="header-anchor">#</a> 一个示例</h4> <ul><li>说明</li></ul> <p><img src="https://img-blog.csdnimg.cn/e30e70ee6cfb4a249cda3da0753e6b42.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <ul><li><strong>实现缓动动画，并可以在多个值之间移动</strong></li></ul> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>X-UA-Compatible<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>IE=edge<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>viewport<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>width=device-width, initial-scale=1.0<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
        <span class="token selector">div</span><span class="token punctuation">{</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> pink<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn500<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>移动500px<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn800<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>移动800px<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
        <span class="token keyword">var</span> div<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'div'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// 封装缓动动画函数</span>
        <span class="token keyword">function</span> <span class="token function">animateLow</span><span class="token punctuation">(</span><span class="token parameter">obj<span class="token punctuation">,</span>target</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
            obj<span class="token punctuation">.</span>timer<span class="token operator">=</span><span class="token function">setInterval</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token comment">// 缓动原理，移动的距离越来越小</span>
                <span class="token comment">// 移动距离=（目标距离-当前移动距离）/10</span>
                <span class="token keyword">var</span> move<span class="token operator">=</span><span class="token punctuation">(</span>target<span class="token operator">-</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token punctuation">)</span><span class="token operator">/</span><span class="token number">10</span><span class="token punctuation">;</span>
                <span class="token comment">// 移动距离取整，往大的方向取</span>
                <span class="token comment">// 移动距离为负数，往小的方向取</span>
                move<span class="token operator">=</span>move<span class="token operator">&gt;=</span><span class="token number">0</span> <span class="token operator">?</span> Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span> <span class="token operator">:</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span><span class="token punctuation">;</span>
                obj<span class="token punctuation">.</span>style<span class="token punctuation">.</span>left<span class="token operator">=</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token operator">+</span>move<span class="token operator">+</span><span class="token string">'px'</span><span class="token punctuation">;</span>

                <span class="token comment">// 停止</span>
                <span class="token keyword">if</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token operator">==</span>target<span class="token punctuation">)</span><span class="token punctuation">{</span>
                    <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token number">50</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">var</span> btn500<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.btn500'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> btn800<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.btn800'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        btn500<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>div<span class="token punctuation">,</span><span class="token number">500</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        btn800<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>div<span class="token punctuation">,</span><span class="token number">800</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/6683d84ef0564adfb02ca3994129dd2d.gif#pic_center" alt="在这里插入图片描述"></p> <h4 id="注意点"><a href="#注意点" class="header-anchor">#</a> 注意点</h4> <ul><li><strong>缓动移动的距离一般为浮点数，需要取整（注意如果距离为正-向上取整，距离为负-向下取整）</strong></li></ul> <h3 id="_1-2-动画函数添加回调函数"><a href="#_1-2-动画函数添加回调函数" class="header-anchor">#</a> 1.2 动画函数添加回调函数</h3> <ul><li>原理：<strong>函数可以作为一个参数，将这个函数传递到另一个函数里面（作为形参），等另一个函数执行完毕后，在执行作为形参的函数，这个过程称为回调</strong></li></ul> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>X-UA-Compatible<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>IE=edge<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>viewport<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>width=device-width, initial-scale=1.0<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
        <span class="token selector">div</span><span class="token punctuation">{</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 100px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> pink<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn500<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>移动500px<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn800<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>移动800px<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
        <span class="token keyword">var</span> div<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'div'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// 封装缓动动画函数</span>

        <span class="token comment">// 2.回调函数</span>
        <span class="token comment">// callback作为函数的形参（代表函数）</span>
        <span class="token keyword">function</span> <span class="token function">animateLow</span><span class="token punctuation">(</span><span class="token parameter">obj<span class="token punctuation">,</span>target<span class="token punctuation">,</span>callback</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
            obj<span class="token punctuation">.</span>timer<span class="token operator">=</span><span class="token function">setInterval</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token comment">// 缓动原理，移动的距离越来越小</span>
                <span class="token comment">// 移动距离=（目标距离-当前移动距离）/10</span>
                <span class="token keyword">var</span> move<span class="token operator">=</span><span class="token punctuation">(</span>target<span class="token operator">-</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token punctuation">)</span><span class="token operator">/</span><span class="token number">10</span><span class="token punctuation">;</span>
                <span class="token comment">// 移动距离取整，往大的方向取</span>
                <span class="token comment">// 移动距离为负数，往小的方向取</span>
                move<span class="token operator">=</span>move<span class="token operator">&gt;=</span><span class="token number">0</span> <span class="token operator">?</span> Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span> <span class="token operator">:</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span><span class="token punctuation">;</span>
                obj<span class="token punctuation">.</span>style<span class="token punctuation">.</span>left<span class="token operator">=</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token operator">+</span>move<span class="token operator">+</span><span class="token string">'px'</span><span class="token punctuation">;</span>

                <span class="token comment">// 停止</span>
                <span class="token keyword">if</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token operator">==</span>target<span class="token punctuation">)</span><span class="token punctuation">{</span>
                    <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>

                    <span class="token comment">// 定时器的任务执行完毕后</span>
                    <span class="token comment">// 执行回调函数</span>
                    <span class="token function">callback</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token number">50</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">var</span> btn500<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.btn500'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> btn800<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.btn800'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        btn500<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>div<span class="token punctuation">,</span><span class="token number">500</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">// 回调函数作为参数传递</span>
        btn800<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>div<span class="token punctuation">,</span><span class="token number">800</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">'你好'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/d67c60d258e8464995e2a466f061ba01.gif#pic_center" alt="在这里插入图片描述"></p> <h3 id="_1-3-动画函数封装后的调用"><a href="#_1-3-动画函数封装后的调用" class="header-anchor">#</a> 1.3 动画函数封装后的调用</h3> <ul><li><strong>封装的动画js</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">function</span> <span class="token function">animateLow</span><span class="token punctuation">(</span><span class="token parameter">obj<span class="token punctuation">,</span>target<span class="token punctuation">,</span>callback</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
    <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
    obj<span class="token punctuation">.</span>timer<span class="token operator">=</span><span class="token function">setInterval</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment">// 缓动原理，移动的距离越来越小</span>
        <span class="token comment">// 移动距离=（目标距离-当前移动距离）/10</span>
        <span class="token keyword">var</span> move<span class="token operator">=</span><span class="token punctuation">(</span>target<span class="token operator">-</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token punctuation">)</span><span class="token operator">/</span><span class="token number">10</span><span class="token punctuation">;</span>
        <span class="token comment">// 移动距离取整，往大的方向取</span>
        <span class="token comment">// 移动距离为负数，往小的方向取</span>
        move<span class="token operator">=</span>move<span class="token operator">&gt;=</span><span class="token number">0</span> <span class="token operator">?</span> Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span> <span class="token operator">:</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span><span class="token punctuation">;</span>
        obj<span class="token punctuation">.</span>style<span class="token punctuation">.</span>left<span class="token operator">=</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token operator">+</span>move<span class="token operator">+</span><span class="token string">'px'</span><span class="token punctuation">;</span>

        <span class="token comment">// 停止</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>offsetLeft<span class="token operator">==</span>target<span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>

            <span class="token comment">// 定时器的任务执行完毕后</span>
            <span class="token comment">// 执行回调函数</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>callback<span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token function">callback</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token number">15</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br></div></div><ul><li>调用动画</li></ul> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>X-UA-Compatible<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>IE=edge<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>viewport<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>width=device-width, initial-scale=1.0<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">

        <span class="token selector">.sliderbar</span><span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">right</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
            <span class="token property">overflow</span><span class="token punctuation">:</span> hidden<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token selector">.sliderbar span</span><span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> skyblue<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">z-index</span><span class="token punctuation">:</span> 10<span class="token punctuation">;</span>
            <span class="token property">text-align</span><span class="token punctuation">:</span> center<span class="token punctuation">;</span>
            <span class="token property">line-height</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token selector">.sliderbar div</span><span class="token punctuation">{</span>
            <span class="token property">box-sizing</span><span class="token punctuation">:</span> border-box<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 200px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> pink<span class="token punctuation">;</span>
            <span class="token property">padding-left</span><span class="token punctuation">:</span> 30px<span class="token punctuation">;</span>
            <span class="token property">line-height</span><span class="token punctuation">:</span> 50px<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./01.动画函数.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>sliderbar<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span><span class="token punctuation">&gt;</span></span> ← <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>box<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>我是内容<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
        <span class="token keyword">var</span> span<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'span'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> div<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.box'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> sliderbar<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.sliderbar'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        span<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'mouseenter'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            sliderbar<span class="token punctuation">.</span>style<span class="token punctuation">.</span>overflow<span class="token operator">=</span><span class="token string">'visible'</span><span class="token punctuation">;</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>div<span class="token punctuation">,</span><span class="token operator">-</span><span class="token number">150</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                span<span class="token punctuation">.</span>innerHTML<span class="token operator">=</span><span class="token string">'→'</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

        span<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'mouseout'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>div<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                span<span class="token punctuation">.</span>innerHTML<span class="token operator">=</span><span class="token string">'←'</span><span class="token punctuation">;</span>
                sliderbar<span class="token punctuation">.</span>style<span class="token punctuation">.</span>overflow<span class="token operator">=</span><span class="token string">'hidden'</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/2807c9b24460439a91184224615cba13.gif#pic_center" alt="在这里插入图片描述"></p> <h2 id="_2-轮播图"><a href="#_2-轮播图" class="header-anchor">#</a> 2. 轮播图</h2> <ul><li>思路</li></ul> <p><img src="https://img-blog.csdnimg.cn/6c672613e93c42a8ba819a6d7b2a3fb9.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/53255c30be7a49cc82d94d711c6a994b.png#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/a25513a2e4414c29a70fd98ce394f2b7.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/8e338230021f4308b9fa843e6cd9a2c5.png#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/8246c2c387424fe3b6ed619c15289b6c.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5YeM5q2G,size_20,color_FFFFFF,t_70,g_se,x_16#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/1bd57840c2344ea08322106959335d23.png#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/e88a6c7d81d04514b9d3480430aa243f.png#pic_center" alt="在这里插入图片描述"></p> <p><img src="https://img-blog.csdnimg.cn/ee60e54241824ee8893fdb15a0e14e33.png#pic_center" alt="在这里插入图片描述"></p> <h4 id="无缝轮播的原理"><a href="#无缝轮播的原理" class="header-anchor">#</a> 无缝轮播的原理</h4> <ul><li><strong>额外添加一张banner图（第一张图），放在最后</strong>，当移动到倒数第二张时，再点击右滑按钮，执行：
<ol><li><strong>倒数第二张到最后一张的动画过渡</strong></li> <li><strong>1执行完毕后，设置大图（所有轮播图）的left，使大图的第一张替换（第一张移动到轮播盒子中心）最后一张（过程不需要过渡），肉眼不可见，实现无缝</strong></li></ol></li> <li>左滑的原理
<ol><li><strong>第一张再点击左移按钮</strong></li> <li><strong>先用最后一张（与第一张相同）替换（最后一张移动到轮播盒子中心）第一张（过程不需要过渡）</strong></li> <li><strong>实现最后一张到倒数第二张的过渡</strong></li></ol></li></ul> <h4 id="一个轮播图案例"><a href="#一个轮播图案例" class="header-anchor">#</a> 一个轮播图案例</h4> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>X-UA-Compatible<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>IE=edge<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>viewport<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>width=device-width, initial-scale=1.0<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">

        <span class="token selector">*</span><span class="token punctuation">{</span>
            <span class="token property">margin</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">padding</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>

        <span class="token punctuation">}</span>

        <span class="token comment">/* 轮播图盒子 */</span>
        <span class="token selector">.box</span><span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 800px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 505px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> pink<span class="token punctuation">;</span>
            <span class="token property">margin</span><span class="token punctuation">:</span> 100px auto<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> relative<span class="token punctuation">;</span>
            <span class="token property">overflow</span><span class="token punctuation">:</span> hidden<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>


        <span class="token comment">/* 左箭头按钮 */</span>
        <span class="token selector">.left</span><span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 22px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 32px<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 50%<span class="token punctuation">;</span>
            <span class="token property">z-index</span><span class="token punctuation">:</span> 1000
        <span class="token punctuation">}</span>

        <span class="token comment">/* 右箭头按钮 */</span>
        <span class="token selector">.right</span><span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 22px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 32px<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">right</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 50%<span class="token punctuation">;</span>
            <span class="token property">z-index</span><span class="token punctuation">:</span> 1000<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">/* 左右箭头宽高由a盒子决定 */</span>
        <span class="token selector">.right img,
        .left img</span><span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 100%<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 100%<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">/* ul要设置足够宽的宽度，在一行能放下4个小li */</span>
        <span class="token selector">ul</span><span class="token punctuation">{</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">overflow</span><span class="token punctuation">:</span> hidden<span class="token punctuation">;</span>
            <span class="token property">list-style</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 600%<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">/* 每个li宽度为ul的1/6 */</span>
        <span class="token selector">ul li</span><span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 800px<span class="token punctuation">;</span>
            <span class="token comment">/* display: block; */</span>
            <span class="token property">float</span><span class="token punctuation">:</span> left<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 100%<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token comment">/* 可点击范围扩大 */</span>
        <span class="token selector">ul li a</span><span class="token punctuation">{</span>
            <span class="token property">display</span><span class="token punctuation">:</span> block<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 100%<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 100%<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">/* 图片与li宽度一致 */</span>
        <span class="token selector">ul li a img</span><span class="token punctuation">{</span>
            <span class="token property">display</span><span class="token punctuation">:</span> block<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 100%<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 100%<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">/* ol轮播指示器水平居中 */</span>
        <span class="token selector">ol</span><span class="token punctuation">{</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">list-style</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
            <span class="token property">bottom</span><span class="token punctuation">:</span> 15px<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 50%<span class="token punctuation">;</span>
            <span class="token property">transform</span><span class="token punctuation">:</span> <span class="token function">translateX</span><span class="token punctuation">(</span>-50%<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> <span class="token function">rgba</span><span class="token punctuation">(</span>255<span class="token punctuation">,</span>255<span class="token punctuation">,</span>255<span class="token punctuation">,</span>.5<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token property">border-radius</span><span class="token punctuation">:</span> 12px<span class="token punctuation">;</span>
            <span class="token property">z-index</span><span class="token punctuation">:</span> 100<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token selector">ol li</span><span class="token punctuation">{</span>
            
            <span class="token property">float</span><span class="token punctuation">:</span> left<span class="token punctuation">;</span>
            
        <span class="token punctuation">}</span>

        <span class="token selector">ol li a</span><span class="token punctuation">{</span>
            <span class="token property">display</span><span class="token punctuation">:</span> block<span class="token punctuation">;</span>
            <span class="token property">margin</span><span class="token punctuation">:</span> 6px<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 12px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 12px<span class="token punctuation">;</span>
            <span class="token property">border-radius</span><span class="token punctuation">:</span> 50%<span class="token punctuation">;</span>
            <span class="token comment">/* ps */</span>
            <span class="token property">border</span><span class="token punctuation">:</span> 1px solid #fff<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

       

        <span class="token comment">/* 选中状态 */</span>
        <span class="token selector">ol li a.current</span><span class="token punctuation">{</span>
            <span class="token property">display</span><span class="token punctuation">:</span> block<span class="token punctuation">;</span>
            <span class="token property">margin</span><span class="token punctuation">:</span> 6px<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 12px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 12px<span class="token punctuation">;</span>
            <span class="token property">border-radius</span><span class="token punctuation">:</span> 50%<span class="token punctuation">;</span>
            <span class="token comment">/* ps */</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> #fff<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>



        <span class="token selector">.clearfix::after,
        .clearfix::before</span><span class="token punctuation">{</span>
            <span class="token property">content</span><span class="token punctuation">:</span> <span class="token string">&quot;&quot;</span><span class="token punctuation">;</span>
            <span class="token property">display</span><span class="token punctuation">:</span> table<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token selector">.clearfix:after</span><span class="token punctuation">{</span>
            <span class="token property">clear</span><span class="token punctuation">:</span> both<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token selector">.clearfix</span><span class="token punctuation">{</span>
            *<span class="token property">zoom</span><span class="token punctuation">:</span> 1<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>



    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>box clearfix<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>

        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>left<span class="token punctuation">&quot;</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>javascript:;<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./images/arrow-prev.png<span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span>

        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>right<span class="token punctuation">&quot;</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>javascript:;<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./images/arrow-next.png<span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span>


        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>ul</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>banner<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>javascript:;<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./images/focus.jpg<span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>

            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>javascript:;<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./images/focus1.jpg<span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>

            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>javascript:;<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./images/focus2.jpg<span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>

            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>javascript:;<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>img</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./images/focus3.jpg<span class="token punctuation">&quot;</span></span> <span class="token attr-name">alt</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
                <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>ul</span><span class="token punctuation">&gt;</span></span>

        <span class="token comment">&lt;!-- 底部轮播按钮部分 --&gt;</span>

        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>ol</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>circle<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
            
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>ol</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./16.动画封装成js文件/01.动画函数.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
        <span class="token keyword">var</span> left<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.left'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> right<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.right'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> box<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.box'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">var</span> timer<span class="token operator">=</span><span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token comment">// 鼠标移入banner图显示左右箭头</span>
        box<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'mouseenter'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            left<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display<span class="token operator">=</span><span class="token string">'block'</span><span class="token punctuation">;</span>
            right<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display<span class="token operator">=</span><span class="token string">'block'</span><span class="token punctuation">;</span>
            <span class="token function">clearInterval</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
            timer<span class="token operator">=</span><span class="token keyword">null</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

        <span class="token comment">// 鼠标移出banner图隐藏左右箭头</span>
        box<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'mouseleave'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            left<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display<span class="token operator">=</span><span class="token string">'none'</span><span class="token punctuation">;</span>
            right<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display<span class="token operator">=</span><span class="token string">'none'</span><span class="token punctuation">;</span>
            timer<span class="token operator">=</span><span class="token function">setInterval</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                right<span class="token punctuation">.</span><span class="token function">click</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

        <span class="token keyword">var</span> ul<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.banner'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> ol<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.circle'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// console.log(ul.children.length);</span>
        <span class="token comment">// 循环生成轮播指示器的个数</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>ul<span class="token punctuation">.</span>children<span class="token punctuation">.</span>length<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>

            <span class="token keyword">var</span> li<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'li'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">var</span> a<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">createElement</span><span class="token punctuation">(</span><span class="token string">'a'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            a<span class="token punctuation">.</span>href<span class="token operator">=</span><span class="token string">'#'</span><span class="token punctuation">;</span>
            
            <span class="token comment">// 生成banner图的个数</span>
            <span class="token comment">// 给ol的li中的a设置下标</span>
            a<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">'index'</span><span class="token punctuation">,</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span>
            li<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">;</span>
            ol<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>li<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">// 设置第一个小圆圈为选中状态</span>
        ol<span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>className<span class="token operator">=</span><span class="token string">'current'</span><span class="token punctuation">;</span>

        <span class="token comment">// 克隆第一个li标签，放在最后，用于实现无缝轮播</span>
        <span class="token keyword">var</span> li1<span class="token operator">=</span>ul<span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">cloneNode</span><span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        ul<span class="token punctuation">.</span><span class="token function">appendChild</span><span class="token punctuation">(</span>li1<span class="token punctuation">)</span><span class="token punctuation">;</span>


        <span class="token comment">// 这也是个思路，额外两图</span>
        <span class="token comment">// 克隆最后一个标签到最前面</span>
        <span class="token comment">// var li2=ul.children[ul.children.length-2].cloneNode(true);</span>
        <span class="token comment">// console.log(li2);</span>
        <span class="token comment">// ul.insertBefore(li2,ul.children[0]);</span>

        <span class="token comment">// 显示第二张图片</span>
        <span class="token comment">// ul.style.left=-ul.clientWidth/6+'px';</span>

        <span class="token comment">// 记录当前图片序号，从0开始</span>
        <span class="token keyword">var</span> numr<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>
        
        <span class="token comment">// 点击轮播指示器，指示器小圆圈变实体白色</span>
        ol<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">var</span> target<span class="token operator">=</span>e<span class="token punctuation">.</span>target<span class="token punctuation">;</span>
            <span class="token comment">// 排他思想</span>
            <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>ol<span class="token punctuation">.</span>children<span class="token punctuation">.</span>length<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                ol<span class="token punctuation">.</span>children<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>className<span class="token operator">=</span><span class="token string">''</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            target<span class="token punctuation">.</span>className<span class="token operator">=</span><span class="token string">'current'</span><span class="token punctuation">;</span>

            <span class="token comment">// 实现图片的移动，也就是ul的移动</span>
            <span class="token keyword">var</span> index<span class="token operator">=</span>target<span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span><span class="token string">'index'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            

            <span class="token keyword">var</span> step<span class="token operator">=</span>index<span class="token operator">*</span>ul<span class="token punctuation">.</span>clientWidth<span class="token operator">/</span><span class="token number">6</span><span class="token punctuation">;</span>
            step<span class="token operator">=</span>Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span>step<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">// console.log(-step);</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>ul<span class="token punctuation">,</span><span class="token operator">-</span>step<span class="token punctuation">)</span><span class="token punctuation">;</span>

            <span class="token comment">// 同步numr值</span>
            numr<span class="token operator">=</span><span class="token function">parseInt</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span><span class="token punctuation">;</span>

              
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

        <span class="token comment">// 左右箭头移动  </span>
        <span class="token comment">// 右侧按钮实现右滑</span>
        right<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>

            <span class="token comment">// 移动到最后一张时检测，迅速换成第一张</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>numr<span class="token operator">===</span>ul<span class="token punctuation">.</span>children<span class="token punctuation">.</span>length<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                ul<span class="token punctuation">.</span>style<span class="token punctuation">.</span>left<span class="token operator">=</span><span class="token string">'0px'</span><span class="token punctuation">;</span>
                numr<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token comment">// 如果时最后一张，实现第一张与第二张的过渡</span>
            numr<span class="token operator">++</span><span class="token punctuation">;</span>
            <span class="token keyword">var</span> step<span class="token operator">=</span>numr<span class="token operator">*</span><span class="token punctuation">(</span>ul<span class="token punctuation">.</span>clientWidth<span class="token operator">/</span><span class="token number">6</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>ul<span class="token punctuation">,</span><span class="token operator">-</span>step<span class="token punctuation">)</span><span class="token punctuation">;</span>
            console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>numr<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token function">check</span><span class="token punctuation">(</span>numr<span class="token punctuation">)</span><span class="token punctuation">;</span>
            
            
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

        <span class="token comment">// 左侧按钮实现左滑</span>
        left<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">// 如果已经是第一张再次左滑</span>
            <span class="token comment">// 先移到最后一张</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>numr<span class="token operator">===</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                numr<span class="token operator">=</span>ul<span class="token punctuation">.</span>children<span class="token punctuation">.</span>length<span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
                ul<span class="token punctuation">.</span>style<span class="token punctuation">.</span>left<span class="token operator">=</span><span class="token operator">-</span><span class="token punctuation">(</span>ul<span class="token punctuation">.</span>clientWidth<span class="token operator">/</span><span class="token number">6</span><span class="token punctuation">)</span><span class="token operator">*</span><span class="token punctuation">(</span>numr<span class="token punctuation">)</span><span class="token operator">+</span><span class="token string">'px'</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token comment">// 再实现最后一张与倒数第二张的切换</span>

            numr<span class="token operator">--</span><span class="token punctuation">;</span>
            <span class="token keyword">var</span> step<span class="token operator">=</span>numr<span class="token operator">*</span>ul<span class="token punctuation">.</span>clientWidth<span class="token operator">/</span><span class="token number">6</span><span class="token punctuation">;</span>
            <span class="token function">animateLow</span><span class="token punctuation">(</span>ul<span class="token punctuation">,</span><span class="token operator">-</span>step<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token function">check</span><span class="token punctuation">(</span>numr<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>


        <span class="token comment">// 循环检测轮播图按钮显示</span>
        <span class="token keyword">function</span> <span class="token function">check</span><span class="token punctuation">(</span><span class="token parameter">numr</span><span class="token punctuation">)</span><span class="token punctuation">{</span>

            <span class="token comment">// 排他思想</span>
            <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>ol<span class="token punctuation">.</span>children<span class="token punctuation">.</span>length<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                ol<span class="token punctuation">.</span>children<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>className<span class="token operator">=</span><span class="token string">''</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token keyword">var</span> circle<span class="token punctuation">;</span>
            <span class="token comment">// 特殊情况，5个图片，1个重复</span>
            circle<span class="token operator">=</span>numr<span class="token punctuation">;</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>numr<span class="token operator">===</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                circle<span class="token operator">=</span>ul<span class="token punctuation">.</span>children<span class="token punctuation">.</span>length<span class="token operator">-</span><span class="token number">2</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token keyword">if</span><span class="token punctuation">(</span>numr<span class="token operator">===</span><span class="token number">4</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                circle<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            <span class="token comment">// console.log(index);</span>
            ol<span class="token punctuation">.</span>children<span class="token punctuation">[</span>circle<span class="token punctuation">]</span><span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>className<span class="token operator">=</span><span class="token string">'current'</span><span class="token punctuation">;</span>
            <span class="token comment">// console.log(ol.children);</span>
        <span class="token punctuation">}</span>

        <span class="token comment">// 刷新界面进入一次</span>
        timer<span class="token operator">=</span><span class="token function">setInterval</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                right<span class="token punctuation">.</span><span class="token function">click</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token number">2000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        
        
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span 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class="line-number">300</span><br><span class="line-number">301</span><br><span class="line-number">302</span><br><span class="line-number">303</span><br><span class="line-number">304</span><br><span class="line-number">305</span><br><span class="line-number">306</span><br><span class="line-number">307</span><br><span class="line-number">308</span><br><span class="line-number">309</span><br><span class="line-number">310</span><br><span class="line-number">311</span><br><span class="line-number">312</span><br><span class="line-number">313</span><br><span class="line-number">314</span><br><span class="line-number">315</span><br><span class="line-number">316</span><br><span class="line-number">317</span><br><span class="line-number">318</span><br><span class="line-number">319</span><br><span class="line-number">320</span><br><span class="line-number">321</span><br><span class="line-number">322</span><br><span class="line-number">323</span><br><span class="line-number">324</span><br><span class="line-number">325</span><br><span class="line-number">326</span><br><span class="line-number">327</span><br><span class="line-number">328</span><br><span class="line-number">329</span><br><span class="line-number">330</span><br><span class="line-number">331</span><br><span class="line-number">332</span><br><span class="line-number">333</span><br><span class="line-number">334</span><br><span class="line-number">335</span><br><span class="line-number">336</span><br><span class="line-number">337</span><br><span class="line-number">338</span><br><span class="line-number">339</span><br><span class="line-number">340</span><br><span class="line-number">341</span><br><span class="line-number">342</span><br><span class="line-number">343</span><br><span class="line-number">344</span><br><span class="line-number">345</span><br><span class="line-number">346</span><br></div></div><ul><li>效果图
<img src="https://img-blog.csdnimg.cn/f8f0dc0d4c5a4bd4bac65a84d9ff9e23.gif#pic_center" alt="在这里插入图片描述"></li></ul> <h2 id="_3-节流阀"><a href="#_3-节流阀" class="header-anchor">#</a> 3. 节流阀</h2> <ul><li><p><strong>目的：防止轮播图按钮连续点击造成播放过快</strong></p></li> <li><p>节流阀目的：当一个函数动画内容执行完毕，再去执行下一个动画函数，让事件无法连续触发</p></li> <li><p><strong>核心开发思路：利用回调函数，添加一个变量控制，锁住函数和解锁函数</strong></p></li> <li><p><strong>具体步骤</strong></p> <ol><li>设置一个变量：var flag=true;</li> <li>if(flag){flag=false;dosomething}   关闭水龙头</li> <li>利用回调函数  ：动画执行完毕，打开水龙头</li></ol></li></ul> <h4 id="示例"><a href="#示例" class="header-anchor">#</a> 示例</h4> <ul><li>防止右滑按钮点击过快</li></ul> <div class="language-html line-numbers-mode"><pre class="language-html"><code>var flag=true;
        right.addEventListener('click',function(){
            if(flag){
                // 关闭水龙头
                flag=false;
                // 移动到最后一张时检测，迅速换成第一张
                if(numr===ul.children.length-1){
                    ul.style.left='0px';
                    numr=0;
                }

                // 如果时最后一张，实现第一张与第二张的过渡
                numr++;
                var step=numr*(ul.clientWidth/6);
                // 回调函数打开水龙头
                animateLow(ul,-step,function(){
                    flag=true;
                });
                console.log(numr);
                check(numr);
            }
        })
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/48f1971a893a408aa43a2fa4826335e3.gif#pic_center" alt="在这里插入图片描述"></p> <p>##4. 返回顶部案例</p> <ul><li><strong>滚动窗口至文档的特定位置</strong></li></ul> <div class="language-html line-numbers-mode"><pre class="language-html"><code>window.scroll(x,y)
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li><p><strong>x,y不跟单位，直接写数字</strong>（x,y代表距离顶部的距离）</p></li> <li><p>x，y为0时，回到顶部</p></li></ul> <h4 id="思路"><a href="#思路" class="header-anchor">#</a> 思路</h4> <p><img src="https://img-blog.csdnimg.cn/a6a75d7e4899495eaf994faa7417b1e3.png#pic_center" alt="在这里插入图片描述"></p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>viewport<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>width=device-width, initial-scale=1.0<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">http-equiv</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>X-UA-Compatible<span class="token punctuation">&quot;</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>ie=edge<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Document<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
        <span class="token selector">.slider-bar</span> <span class="token punctuation">{</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 50%<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 300px<span class="token punctuation">;</span>
            <span class="token property">margin-left</span><span class="token punctuation">:</span> 600px<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 45px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 130px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> pink<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.w</span> <span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 1200px<span class="token punctuation">;</span>
            <span class="token property">margin</span><span class="token punctuation">:</span> 10px auto<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.header</span> <span class="token punctuation">{</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 150px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> purple<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.banner</span> <span class="token punctuation">{</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 250px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> skyblue<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.main</span> <span class="token punctuation">{</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 1000px<span class="token punctuation">;</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> yellowgreen<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">span</span> <span class="token punctuation">{</span>
            <span class="token property">display</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">bottom</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>slider-bar<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>goBack<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>返回顶部<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>header w<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>头部区域<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>banner w<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>banner区域<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>main w<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>主体部分<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
        <span class="token comment">// 获取banner</span>
        <span class="token keyword">var</span> banner<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.banner'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> sliderbar<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.slider-bar'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> bannerTop<span class="token operator">=</span>banner<span class="token punctuation">.</span>offsetTop<span class="token punctuation">;</span>
        <span class="token comment">// 固定定位后的距离</span>
        <span class="token keyword">var</span> sliderTop<span class="token operator">=</span>sliderbar<span class="token punctuation">.</span>offsetTop<span class="token operator">-</span>bannerTop<span class="token punctuation">;</span>

        <span class="token comment">// 获取main</span>
        <span class="token keyword">var</span> main<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.main'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> mainTop<span class="token operator">=</span>main<span class="token punctuation">.</span>offsetTop<span class="token punctuation">;</span>
        <span class="token comment">// 获取回到顶部</span>
        <span class="token keyword">var</span> goBack<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.goBack'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// 当页面被卷去的距离为banner区域的offsetTop时，滚动导航栏变为固定单位</span>
        document<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'scroll'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            
            
            <span class="token keyword">if</span><span class="token punctuation">(</span>window<span class="token punctuation">.</span>pageYOffset<span class="token operator">&gt;=</span>bannerTop<span class="token punctuation">)</span><span class="token punctuation">{</span>
                sliderbar<span class="token punctuation">.</span>style<span class="token punctuation">.</span>position<span class="token operator">=</span><span class="token string">'fixed'</span><span class="token punctuation">;</span>
                sliderbar<span class="token punctuation">.</span>style<span class="token punctuation">.</span>top<span class="token operator">=</span>sliderTop<span class="token operator">+</span><span class="token string">'px'</span><span class="token punctuation">;</span>

            <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
                sliderbar<span class="token punctuation">.</span>style<span class="token punctuation">.</span>position<span class="token operator">=</span><span class="token string">'absolute'</span><span class="token punctuation">;</span>
                sliderbar<span class="token punctuation">.</span>style<span class="token punctuation">.</span>top<span class="token operator">=</span><span class="token string">'300px'</span><span class="token punctuation">;</span> 
            <span class="token punctuation">}</span>

            <span class="token keyword">if</span><span class="token punctuation">(</span>window<span class="token punctuation">.</span>pageYOffset<span class="token operator">&gt;=</span>mainTop<span class="token punctuation">)</span><span class="token punctuation">{</span>
                goBack<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display<span class="token operator">=</span><span class="token string">'block'</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
                goBack<span class="token punctuation">.</span>style<span class="token punctuation">.</span>display<span class="token operator">=</span><span class="token string">'none'</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

            goBack<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token comment">// window.scroll使窗口滚动到顶部</span>
                <span class="token comment">// window.scroll(0,0);</span>

                <span class="token comment">// 2.使用缓动函数实现带动画的回到顶部</span>
                <span class="token function">animateLow</span><span class="token punctuation">(</span>window<span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

            <span class="token punctuation">}</span><span class="token punctuation">)</span>


            <span class="token keyword">function</span> <span class="token function">animateLow</span><span class="token punctuation">(</span><span class="token parameter">obj<span class="token punctuation">,</span>target<span class="token punctuation">,</span>callback</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
                obj<span class="token punctuation">.</span>timer<span class="token operator">=</span><span class="token function">setInterval</span><span class="token punctuation">(</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                    <span class="token comment">// 缓动原理，移动的距离越来越小</span>
                    <span class="token comment">// 移动距离=（目标距离-当前移动距离）/10</span>
                    <span class="token keyword">var</span> move<span class="token operator">=</span><span class="token punctuation">(</span>target<span class="token operator">-</span>obj<span class="token punctuation">.</span>pageYOffset<span class="token punctuation">)</span><span class="token operator">/</span><span class="token number">10</span><span class="token punctuation">;</span>
                    <span class="token comment">// 移动距离取整，往大的方向取</span>
                    <span class="token comment">// 移动距离为负数，往小的方向取</span>
                    move<span class="token operator">=</span>move<span class="token operator">&gt;=</span><span class="token number">0</span> <span class="token operator">?</span> Math<span class="token punctuation">.</span><span class="token function">ceil</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span> <span class="token operator">:</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>move<span class="token punctuation">)</span><span class="token punctuation">;</span>
                    <span class="token comment">// obj.style.left=obj.offsetLeft+move+'px';</span>
                    obj<span class="token punctuation">.</span><span class="token function">scroll</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span>move<span class="token operator">+</span>obj<span class="token punctuation">.</span>pageYOffset<span class="token punctuation">)</span><span class="token punctuation">;</span>

                    <span class="token comment">// 停止</span>
                    <span class="token keyword">if</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>pageYOffset<span class="token operator">==</span>target<span class="token punctuation">)</span><span class="token punctuation">{</span>
                        <span class="token function">clearInterval</span><span class="token punctuation">(</span>obj<span class="token punctuation">.</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>

                        <span class="token comment">// 定时器的任务执行完毕后</span>
                        <span class="token comment">// 执行回调函数</span>
                        <span class="token keyword">if</span><span class="token punctuation">(</span>callback<span class="token punctuation">)</span><span class="token punctuation">{</span>
                            <span class="token function">callback</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                        <span class="token punctuation">}</span>
                        
                    <span class="token punctuation">}</span>
                <span class="token punctuation">}</span><span class="token punctuation">,</span><span class="token number">15</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>

        <span class="token punctuation">}</span><span class="token punctuation">)</span>
        
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
    
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span 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class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br><span class="line-number">121</span><br><span class="line-number">122</span><br><span class="line-number">123</span><br><span class="line-number">124</span><br><span class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/fd17e0f0aa904cdbad39a54b14820f8b.gif#pic_center" alt="在这里插入图片描述"></p> <h2 id="_5-筋斗云首页案例"><a href="#_5-筋斗云首页案例" class="header-anchor">#</a> 5.筋斗云首页案例</h2> <ul><li>思路分析</li></ul> <p><img src="https://img-blog.csdnimg.cn/82e706f5e76d4ddab32294f4e1b5ae03.png#pic_center" alt="在这里插入图片描述"></p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>UTF-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>style</span><span class="token punctuation">&gt;</span></span><span class="token style"><span class="token language-css">
        <span class="token selector">*</span> <span class="token punctuation">{</span>
            <span class="token property">margin</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">padding</span><span class="token punctuation">:</span> 0
        <span class="token punctuation">}</span>
        
        <span class="token selector">ul</span> <span class="token punctuation">{</span>
            <span class="token property">list-style</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">body</span> <span class="token punctuation">{</span>
            <span class="token property">background-color</span><span class="token punctuation">:</span> black<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.c-nav</span> <span class="token punctuation">{</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 900px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 42px<span class="token punctuation">;</span>
            <span class="token property">background</span><span class="token punctuation">:</span> #fff <span class="token url"><span class="token function">url</span><span class="token punctuation">(</span>images/rss.png<span class="token punctuation">)</span></span> no-repeat right center<span class="token punctuation">;</span>
            <span class="token property">margin</span><span class="token punctuation">:</span> 100px auto<span class="token punctuation">;</span>
            <span class="token property">border-radius</span><span class="token punctuation">:</span> 5px<span class="token punctuation">;</span>
            <span class="token property">position</span><span class="token punctuation">:</span> relative<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.c-nav ul</span> <span class="token punctuation">{</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.c-nav li</span> <span class="token punctuation">{</span>
            <span class="token property">float</span><span class="token punctuation">:</span> left<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 83px<span class="token punctuation">;</span>
            <span class="token property">text-align</span><span class="token punctuation">:</span> center<span class="token punctuation">;</span>
            <span class="token property">line-height</span><span class="token punctuation">:</span> 42px<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.c-nav li a</span> <span class="token punctuation">{</span>
            <span class="token property">color</span><span class="token punctuation">:</span> #333<span class="token punctuation">;</span>
            <span class="token property">text-decoration</span><span class="token punctuation">:</span> none<span class="token punctuation">;</span>
            <span class="token property">display</span><span class="token punctuation">:</span> inline-block<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 42px<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.c-nav li a:hover</span> <span class="token punctuation">{</span>
            <span class="token property">color</span><span class="token punctuation">:</span> white<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        
        <span class="token selector">.cloud</span> <span class="token punctuation">{</span>
            <span class="token property">position</span><span class="token punctuation">:</span> absolute<span class="token punctuation">;</span>
            <span class="token property">left</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">top</span><span class="token punctuation">:</span> 0<span class="token punctuation">;</span>
            <span class="token property">width</span><span class="token punctuation">:</span> 83px<span class="token punctuation">;</span>
            <span class="token property">height</span><span class="token punctuation">:</span> 42px<span class="token punctuation">;</span>
            <span class="token property">background</span><span class="token punctuation">:</span> <span class="token url"><span class="token function">url</span><span class="token punctuation">(</span>images/cloud.gif<span class="token punctuation">)</span></span> no-repeat<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>style</span><span class="token punctuation">&gt;</span></span>

    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>./01.动画函数.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span><span class="token punctuation">&gt;</span></span><span class="token script"><span class="token language-javascript">
        window<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'load'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">var</span> cloud<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.cloud'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">var</span> nav<span class="token operator">=</span>document<span class="token punctuation">.</span><span class="token function">querySelector</span><span class="token punctuation">(</span><span class="token string">'.c-nav'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">// console.log(nav);</span>
            <span class="token comment">// 获取所有的小li</span>
            <span class="token comment">// 使用冒泡</span>

            <span class="token comment">// nav.addEventListener('mouseover',function(e){</span>
            <span class="token comment">//     var target=e.target;</span>
            <span class="token comment">//     console.log(target);</span>
            <span class="token comment">//     console.log(target.offsetLeft);</span>
            <span class="token comment">//     cloud.style.left=target.offsetLeft+'px';</span>
            <span class="token comment">// })</span>

            <span class="token comment">// 冒泡a和li不好区分</span>
            <span class="token keyword">var</span> list<span class="token operator">=</span>nav<span class="token punctuation">.</span><span class="token function">querySelectorAll</span><span class="token punctuation">(</span><span class="token string">'li'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">var</span> space<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>
            <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">var</span> i<span class="token operator">=</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">&lt;</span>list<span class="token punctuation">.</span>length<span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                <span class="token comment">// 经过时移动</span>
                list<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'mouseover'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                    <span class="token function">animateLow</span><span class="token punctuation">(</span>cloud<span class="token punctuation">,</span><span class="token keyword">this</span><span class="token punctuation">.</span>offsetLeft<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

                <span class="token comment">// 离开时返回原值</span>
                list<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'mouseout'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                    <span class="token function">animateLow</span><span class="token punctuation">(</span>cloud<span class="token punctuation">,</span>space<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token punctuation">)</span>

                <span class="token comment">// 点击时修改space的默认值</span>
                list<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span><span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                    space<span class="token operator">=</span><span class="token keyword">this</span><span class="token punctuation">.</span>offsetLeft<span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token punctuation">)</span>
            <span class="token punctuation">}</span>

        <span class="token punctuation">}</span><span class="token punctuation">)</span>
    </span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>c_nav<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>c-nav<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>span</span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>cloud<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>span</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>ul</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>首页新闻<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>师资力量<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>活动策划<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>企业文化<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>招聘信息<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>公司简介<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>我是佩奇<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
            <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>li</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>a</span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>#<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>啥是佩奇<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>a</span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>li</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>ul</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br></div></div><ul><li>效果图</li></ul> <p><img src="https://img-blog.csdnimg.cn/6bc7e081d5c7428a8d59d1689d5c22b3.gif#pic_center" alt="在这里插入图片描述"></p></div></div>  <div 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